Android申請相機(jī)權(quán)限和讀寫權(quán)限實例

更新時間：2022年02月11日 15:50:59 作者：井井帆

大家好，本篇文章主要講的是Android申請相機(jī)權(quán)限和讀寫權(quán)限實例，感興趣的同學(xué)趕快來看一看吧，對你有幫助的話記得收藏一下

開發(fā)一個相機(jī)應(yīng)用，需要申請三個權(quán)限：相機(jī)、讀文件、寫文件。

1、在AndroidManifest.xml中添加

<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

2、新建一個Permission類

public class Permission {
    public static final int REQUEST_CODE = 5;
    //定義三個權(quán)限
    private static final String[] permission = new String[]{
            Manifest.permission.CAMERA,
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
    };
    //每個權(quán)限是否已授
    public static boolean isPermissionGranted(Activity activity){
        if(Build.VERSION.SDK_INT >= 23){
            for(int i = 0; i < permission.length;i++) {  
                int checkPermission = ContextCompat.checkSelfPermission(activity,permission[i]);
                /***
                 * checkPermission返回兩個值
                 * 有權(quán)限: PackageManager.PERMISSION_GRANTED
                 * 無權(quán)限: PackageManager.PERMISSION_DENIED
                 */
                if(checkPermission != PackageManager.PERMISSION_GRANTED){
                    return false;
                }
            }
            return true;
        }else{
            return true;
        }
    }

    public static boolean checkPermission(Activity activity){
        if(isPermissionGranted(activity)) {
            return true;
        } else {
            //如果沒有設(shè)置過權(quán)限許可，則彈出系統(tǒng)的授權(quán)窗口
            ActivityCompat.requestPermissions(activity,permission,REQUEST_CODE);
            return false;
        }
    }
}

3、在MainActivity中加入授權(quán)操作

@Override
    protected void onStart() {
        super.onStart();
        Permission.checkPermission(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        if(Permission.isPermissionGranted(this)) {
            Log.i("PERMISSION","請求權(quán)限成功");
        }
    }

初步授權(quán)成功

4、在MainActivity中處理授權(quán)失敗結(jié)果，拒絕授權(quán)則退出應(yīng)用

    @Override
    public void onRequestPermissionsResult(
            int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == Permission.REQUEST_CODE) {
            for (int grantResult : grantResults) {
                if (grantResult != PackageManager.PERMISSION_GRANTED) {
                    Log.e("Permission","授權(quán)失??！");
                    // 授權(quán)失敗，退出應(yīng)用
                    this.finish();
                    return;
                }
            }
        }
    }

效果圖